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+<!DOCTYPE html>
+<body>
+<html>
+<select id="test" size="8">
+</select>
+<script>
+ var optgroup = document.createElement("optgroup");
+ optgroup.setAttribute('label', 'An optgroup');
+ var option = document.createElement("option");
+ var optionText = document.createTextNode("An option");
+ option.appendChild(optionText);
+ var select = document.getElementById("test");
+
+ select.appendChild(optgroup);
+ optgroup.appendChild(option);
+</script>
+</body>
+</html>